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      Activity--启动新的Activity
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        <p>Activity是Android组件中最基本也是最为常见用的四大组件（Activity，Service服务，Content Provider内容提供，BroadcastReceiver广播接收器）之一.  </p>
<p>几乎所有的Activity都是用来与用户交互的，Activity主要关注与视图窗体的创建，一个应用程序可以包含零个或者多个Activity，但是包含零个Activity的应用比较少。</p>
<span id="more"></span> 

<p>其实通俗来说，我们可以把手机当做一个浏览器，而Activity就是其中的一个个网页，在Activity上面，我们可以添加不同的控件View，并且可以执行一些操作逻辑。</p>
<hr>
<h4 id="通过Intent-启动新的Activity"><a href="#通过Intent-启动新的Activity" class="headerlink" title="通过Intent,启动新的Activity"></a>通过Intent,启动新的Activity</h4><blockquote>
<p>Intent 是 Activity程序中各组件之间进行交互的一种重要方式,它不仅可以指明当前组件想要执行的动作,还可以在不同组件之间传递数据. Intent 一般可被用于启动 Activity, 启动服务以及发送广播等场景.  </p>
<p>Intent 大致可分为两种: <strong>显式 Intent</strong> 和 <strong>隐式 Intent</strong>  </p>
</blockquote>
<h5 id="1-1-显式-Intent-启动-Activity"><a href="#1-1-显式-Intent-启动-Activity" class="headerlink" title="1.1 显式 Intent 启动 Activity"></a>1.1 显式 Intent 启动 Activity</h5><pre><code class="java">Button button3 = (Button) findViewById(R.id.button3);
button3.setOnClickListener(new View.OnClickListener()&#123;
            @Override
            public void onClick(View v)&#123;
                // 跳转到第二个Activity
                Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
                startActivity(intent);
            &#125;
&#125;);  
</code></pre>
<p>通过上面代码中 Intent 构造可看出,是在 FirstActivity 这个 Activity 的基础上打开 SecondActivity.<br>(第一个参数是上下文,第二个参数是目标Activity.)</p>
<h5 id="1-2-隐式-Intent-启动-Activity"><a href="#1-2-隐式-Intent-启动-Activity" class="headerlink" title="1.2 隐式 Intent 启动 Activity"></a>1.2 隐式 Intent 启动 Activity</h5><p>想要隐式启动某个Activity,<br>首先,需要在清单文件中对这个Activity添加响应声明,即在<code>&lt;activity&gt;</code> 标签下配置<code>&lt;intent-filter&gt;</code>的内容<br>通常<code>&lt;intent-filter&gt;</code>包含以下几个方面: </p>
<ul>
<li><strong>action</strong> activity对应的动作。 可以用任意一个字符串描述（最好，顾名思义）</li>
<li><strong>category</strong> 额外的类别参数。  指定工作的设备（车载电脑，机顶盒，默认的手机） 通常指定的参数<code>android.intent.category.DEFAULT</code></li>
<li><strong>data</strong>  指定数据和数据的类型  <ul>
<li>scheme 数据前缀</li>
<li>host 主机名</li>
<li>port 端口号</li>
<li>path 路径 记得在前面加上 /</li>
<li>mimeType 数据类型 从tomcat里面查找常见的数据类型</li>
</ul>
</li>
</ul>
<p>下面代码中:在清单文件中注册两个Activity,并都配置<code>&lt;intent-filter&gt;</code></p>
<pre><code class="java">&lt;activity android:name=&quot;com.yassblog.SecondActivity&quot;&gt;
            &lt;intent-filter&gt;
                &lt;action android:name=&quot;com.yassblog.activitytest.ACTION_START&quot;/&gt;
                &lt;category android:name=&quot;android.intent.category.DEFAULT&quot;/&gt;
            &lt;/intent-filter&gt;
&lt;/activity&gt;  
&lt;activity android:name=&quot;com.yassblog.CeshiActivity&quot; &gt;
            &lt;intent-filter&gt;
                &lt;action android:name=&quot;com.yassblog.a1&quot; /&gt;
                &lt;data android:scheme=&quot;youyiyi1&quot; /&gt;
                &lt;action android:name=&quot;com.yassblog.a3&quot; /&gt;
                &lt;data android:scheme=&quot;youyiyi3&quot; /&gt;
                &lt;data android:mimeType=&quot;text/name&quot; /&gt;
                &lt;category android:name=&quot;android.intent.category.DEFAULT&quot; /&gt;
            &lt;/intent-filter&gt;
            &lt;intent-filter&gt;
                &lt;action android:name=&quot;com.yassblog.a2&quot; /&gt;
                &lt;data android:scheme=&quot;youyiyi2&quot; /&gt;
                &lt;category android:name=&quot;android.intent.category.DEFAULT&quot; /&gt;
            &lt;/intent-filter&gt;
&lt;/activity&gt;
</code></pre>
<p>接着,修改按钮点击事件,隐式启动新的Activity  </p>
<pre><code class="java">Button button4 = (Button) findViewById(R.id.button4);
button4.setOnClickListener(new View.OnClickListener()&#123;
            @Override
            public void onClick(View v)&#123;
                // 隐式跳转到第二个Activity
                Intent intent = new Intent(&quot;com.yassblog.activitytest.ACTION_START&quot;);
                startActivity(intent);
            &#125;
&#125;);  
public void click41(View v)&#123;
        Intent intent = new Intent();
        intent.setAction(&quot;com.yassblog.a1&quot;);
        //匹配mimetype
        //intent.setType(&quot;text/name&quot;);
        //匹配scheme，注意setData()会将上面的setType清除
        //intent.setData(Uri.parse(&quot;youyiyi3:xiaoming&quot;));
        //匹配scheme和mimetype
        intent.setDataAndType(Uri.parse(&quot;youyiyi3:xiaoming&quot;), &quot;text/name&quot;);
        //如果没有指定category，则自动添加以下代码
        //intent.addCategory(Intent.CATEGORY_DEFAULT);
        startActivity(intent);
    &#125;  
public void click42(View v) &#123;
        Intent intent = new Intent();
        // 匹配动作
        intent.setAction(&quot;com.yassblog.a2&quot;);
        // 匹配scheme
        intent.setData(Uri.parse(&quot;youyiyi2:xiaoming&quot;));

        startActivity(intent);
    &#125;
</code></pre>
<p>注意:<br>设置参数时setType()会清除setData()，而setData()会清除setType(), 两者不能共存，所以通过<code>setDataAndType(Uri.parse(&quot;youyiyi3:xiaoming&quot;), &quot;text/name&quot;)</code>; 一并将两者全部设置了.<br>intent-filter节点及其子节点都可以同时定义多个，隐式启动时只需与任意一个匹配即可  </p>
<p>下面是对隐式 Intent 启动 Activity的解释:<br>我们通过将一系列更为抽象的 action 和 category 等信息封装到 Intent 中,然后交由系统去分析这个 Intent ,并帮我们找出合适的 Activity 去启动的方式,称为隐式 Intent 启动.  </p>
<p>从上面代码可以看到,我们使用了 Intent的另一种构造函数,<br>通过直接将 action 的字符串传了进来,表明我们想要启动能够响应 com.yassblog.activitytest.ACTION_START 的 Activity. 那前面不是说要 action 和 category 同时匹配上才能响应吗? 这里怎么没看到有指定 category 呢? 这是因为 android.intent.category.DEFAULT  是一种默认的 category,在调用 startActivity() 方法时已经自动将这个 category 封装到 Intent 中了,所以这个Intent 既有 action 也有 category .  当我们在FirstActivity 的界面点击按钮,就成功启动 SecondActivity 了.  </p>
<p>启动Activity时,每个Intent中只能封装一个 action ,但是却能封装多个 category.比如下面的例子,<br>1 先在清单文件中添加category  </p>
<pre><code class="java">&lt;activity android:name=&quot;.SecondActivity&quot;&gt;
            &lt;intent-filter&gt;
                &lt;action android:name=&quot;com.yassblog.activitytest.ACTION_START&quot;/&gt;
                &lt;category android:name=&quot;android.intent.category.DEFAULT&quot;/&gt;
                &lt;category android:name=&quot;com.yassblog.activitytest.MY_CATEGORY&quot;/&gt;
            &lt;/intent-filter&gt;
        &lt;/activity&gt;  
</code></pre>
<p>2 再在Intent中添加一个category,并启动Activity  </p>
<pre><code class="java">Button button5 = (Button) findViewById(R.id.button5);
button5.setOnClickListener(new View.OnClickListener()&#123;
            @Override
            public void onClick(View v)&#123;
                // 添加category,隐式跳转Activity
                Intent intent = new Intent(&quot;com.yassblog.activitytest.ACTION_START&quot;);
                intent.addCategory(&quot;com.yassblog.activitytest.MY_CATEGORY&quot;);
                startActivity(intent);
            &#125;
&#125;);  
</code></pre>
<h5 id="1-3-很多系统应用界面-可以通过隐式-Intent-启动"><a href="#1-3-很多系统应用界面-可以通过隐式-Intent-启动" class="headerlink" title="1.3 很多系统应用界面,可以通过隐式 Intent 启动"></a>1.3 很多系统应用界面,可以通过隐式 Intent 启动</h5><h6 id="1-3-1-打开浏览器网页"><a href="#1-3-1-打开浏览器网页" class="headerlink" title="1.3.1 打开浏览器网页"></a>1.3.1 打开浏览器网页</h6><pre><code class="java">Button button6 = (Button) findViewById(R.id.button6);
button6.setOnClickListener(new View.OnClickListener()&#123;
            @Override
            public void onClick(View v)&#123;
                // 打开网页
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(&quot;http://www.baidu.com&quot;));
                startActivity(intent);
            &#125;
        &#125;);  
</code></pre>
<h6 id="1-3-2-打开拨号界面"><a href="#1-3-2-打开拨号界面" class="headerlink" title="1.3.2 打开拨号界面"></a>1.3.2 打开拨号界面</h6><pre><code class="java">Button button7 = (Button) findViewById(R.id.button7);
button7.setOnClickListener(new View.OnClickListener()&#123;
            @Override
            public void onClick(View v)&#123;
                // 打开拨号界面
                Intent intent = new Intent(Intent.ACTION_DIAL);
                intent.setData(Uri.parse(&quot;tel:10086&quot;));
                startActivity(intent);
            &#125;
        &#125;);  
</code></pre>
<hr>
<p>源码下载: <a target="_blank" rel="noopener" href="http://oss.wxyass.com/wxyass/demo/ActivityTest.rar">http://oss.wxyass.com/wxyass/demo/ActivityTest.rar</a>  </p>

      
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